(.NET Core C#) GeoOp Exchange Refresh Token for New Access Token

Demonstrates how to use the /oauth2/token endpoint to exchange it for a new access token once the current access token has expired.

Note: This example requires Chilkat v9.5.0.65 or greater.

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// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// This example also assumes that OAuth2 access and refresh tokens were previously fetched.
// and saved in a JSON file.  

// First get our previously obtained refresh token.
// { .... "refresh_token":"e6dqdG....mzjpT04w==", .... }
Chilkat.JsonObject jsonToken = new Chilkat.JsonObject();
bool success = jsonToken.LoadFile("qa_data/tokens/geoop.json");

Chilkat.Rest rest = new Chilkat.Rest();

// Connect to GeoOp...
bool bAutoReconnect = true;
success = rest.Connect("login.geoop.com",443,true,bAutoReconnect);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

// Set the X-Version header.
rest.AddHeader("X-Version","1.0");

// Provide the required form params to get the new access token
Debug.WriteLine("refresh_token = " + jsonToken.StringOf("refresh_token"));
rest.AddQueryParam("refresh_token",jsonToken.StringOf("refresh_token"));
rest.AddQueryParam("grant_type","refresh_token");
rest.AddQueryParam("client_id","GEOOP-CLIENT-ID");
rest.AddQueryParam("client_secret","GEOOP-CLIENT-SECRET");

string responseBody = rest.FullRequestFormUrlEncoded("POST","/oauth2/token");
if (rest.LastMethodSuccess != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

// If the response status code did not indicate success, then see what happened..
if (rest.ResponseStatusCode != 200) {
    Debug.WriteLine("Request Header: ");
    Debug.WriteLine(rest.LastRequestHeader);
    Debug.WriteLine("----");
    Debug.WriteLine("Response StatusCode = " + Convert.ToString(rest.ResponseStatusCode));
    Debug.WriteLine("Response StatusLine: " + rest.ResponseStatusText);
    Debug.WriteLine("Response Header:");
    Debug.WriteLine(rest.ResponseHeader);
    Debug.WriteLine(responseBody);
    return;
}

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.EmitCompact = false;
json.Load(responseBody);

// Show the full JSON response.  It should contain the new access token...
Debug.WriteLine(json.Emit());